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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: BoundaryInputStream.html 5 2014-12-10 22:27:01Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.msrp.msg;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.io.EOFException;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.io.FilterInputStream;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import java.io.IOException;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import java.io.InputStream;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>/**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Reads from an underlying {@link InputStream} until an MSRP end-line boundary is encountered.<a name="line.16"></a>
<span class="sourceLineNo">017</span> */<a name="line.17"></a>
<span class="sourceLineNo">018</span>public class BoundaryInputStream extends FilterInputStream {<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>    private final BoundaryInputParser parser;<a name="line.20"></a>
<span class="sourceLineNo">021</span>    private byte[] data;<a name="line.21"></a>
<span class="sourceLineNo">022</span>    private int offset;<a name="line.22"></a>
<span class="sourceLineNo">023</span>    private boolean eof;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    /**<a name="line.25"></a>
<span class="sourceLineNo">026</span>     * Constructor.<a name="line.26"></a>
<span class="sourceLineNo">027</span>     *<a name="line.27"></a>
<span class="sourceLineNo">028</span>     * @param input underlying input<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * @param transactionId transaction ID<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * @throws IllegalArgumentException if {@code input} is null<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * @throws IllegalArgumentException if {@code transactionId} is null or invalid<a name="line.31"></a>
<span class="sourceLineNo">032</span>     */<a name="line.32"></a>
<span class="sourceLineNo">033</span>    public BoundaryInputStream(InputStream input, String transactionId) {<a name="line.33"></a>
<span class="sourceLineNo">034</span>        super(input);<a name="line.34"></a>
<span class="sourceLineNo">035</span>        this.parser = new BoundaryInputParser(transactionId);<a name="line.35"></a>
<span class="sourceLineNo">036</span>    }<a name="line.36"></a>
<span class="sourceLineNo">037</span><a name="line.37"></a>
<span class="sourceLineNo">038</span>// InputStream methods<a name="line.38"></a>
<span class="sourceLineNo">039</span><a name="line.39"></a>
<span class="sourceLineNo">040</span>    /**<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * Read the next byte.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     *<a name="line.42"></a>
<span class="sourceLineNo">043</span>     * @return next byte prior to boundary, or -1 if the boundary has been seen<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @throws EOFException if EOF is detected before the boundary is seen<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @throws IOException if an I/O error occurs<a name="line.45"></a>
<span class="sourceLineNo">046</span>     */<a name="line.46"></a>
<span class="sourceLineNo">047</span>    @Override<a name="line.47"></a>
<span class="sourceLineNo">048</span>    public int read() throws IOException {<a name="line.48"></a>
<span class="sourceLineNo">049</span><a name="line.49"></a>
<span class="sourceLineNo">050</span>        // Done?<a name="line.50"></a>
<span class="sourceLineNo">051</span>        if (this.eof)<a name="line.51"></a>
<span class="sourceLineNo">052</span>            return -1;<a name="line.52"></a>
<span class="sourceLineNo">053</span><a name="line.53"></a>
<span class="sourceLineNo">054</span>        // Shift input bytes into parser until we get something back<a name="line.54"></a>
<span class="sourceLineNo">055</span>        while (this.data == null || this.offset == this.data.length) {<a name="line.55"></a>
<span class="sourceLineNo">056</span>            final int r = super.read();<a name="line.56"></a>
<span class="sourceLineNo">057</span>            if (r == -1)<a name="line.57"></a>
<span class="sourceLineNo">058</span>                throw new EOFException("detected EOF before boundary string was matched");<a name="line.58"></a>
<span class="sourceLineNo">059</span>            if ((this.data = this.parser.inputContentByte((byte)r)) == null) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>                this.eof = true;<a name="line.60"></a>
<span class="sourceLineNo">061</span>                return -1;<a name="line.61"></a>
<span class="sourceLineNo">062</span>            }<a name="line.62"></a>
<span class="sourceLineNo">063</span>            this.offset = 0;<a name="line.63"></a>
<span class="sourceLineNo">064</span>        }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>        // Return next byte<a name="line.66"></a>
<span class="sourceLineNo">067</span>        return this.data[this.offset++];<a name="line.67"></a>
<span class="sourceLineNo">068</span>    }<a name="line.68"></a>
<span class="sourceLineNo">069</span><a name="line.69"></a>
<span class="sourceLineNo">070</span>    @Override<a name="line.70"></a>
<span class="sourceLineNo">071</span>    public int read(byte[] b, int off, int len) throws IOException {<a name="line.71"></a>
<span class="sourceLineNo">072</span>        int total = 0;<a name="line.72"></a>
<span class="sourceLineNo">073</span>        while (off &lt; len) {<a name="line.73"></a>
<span class="sourceLineNo">074</span>            final int r = this.read();<a name="line.74"></a>
<span class="sourceLineNo">075</span>            if (r == -1)<a name="line.75"></a>
<span class="sourceLineNo">076</span>                return total == 0 ? -1 : total;<a name="line.76"></a>
<span class="sourceLineNo">077</span>            b[off++] = (byte)r;<a name="line.77"></a>
<span class="sourceLineNo">078</span>            total++;<a name="line.78"></a>
<span class="sourceLineNo">079</span>        }<a name="line.79"></a>
<span class="sourceLineNo">080</span>        return total;<a name="line.80"></a>
<span class="sourceLineNo">081</span>    }<a name="line.81"></a>
<span class="sourceLineNo">082</span><a name="line.82"></a>
<span class="sourceLineNo">083</span>    @Override<a name="line.83"></a>
<span class="sourceLineNo">084</span>    public long skip(long n) throws IOException {<a name="line.84"></a>
<span class="sourceLineNo">085</span>        long total = 0;<a name="line.85"></a>
<span class="sourceLineNo">086</span>        while (n-- &gt; 0) {<a name="line.86"></a>
<span class="sourceLineNo">087</span>            if (this.read() == -1)<a name="line.87"></a>
<span class="sourceLineNo">088</span>                break;<a name="line.88"></a>
<span class="sourceLineNo">089</span>            total++;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        }<a name="line.90"></a>
<span class="sourceLineNo">091</span>        return total;<a name="line.91"></a>
<span class="sourceLineNo">092</span>    }<a name="line.92"></a>
<span class="sourceLineNo">093</span><a name="line.93"></a>
<span class="sourceLineNo">094</span>    @Override<a name="line.94"></a>
<span class="sourceLineNo">095</span>    public int available() throws IOException {<a name="line.95"></a>
<span class="sourceLineNo">096</span>        return this.data != null ? this.data.length - this.offset : 0;<a name="line.96"></a>
<span class="sourceLineNo">097</span>    }<a name="line.97"></a>
<span class="sourceLineNo">098</span><a name="line.98"></a>
<span class="sourceLineNo">099</span>    /**<a name="line.99"></a>
<span class="sourceLineNo">100</span>     * Mark this instance. This operation is not supported by {@link BoundaryInputStream}.<a name="line.100"></a>
<span class="sourceLineNo">101</span>     *<a name="line.101"></a>
<span class="sourceLineNo">102</span>     * @throws UnsupportedOperationException always<a name="line.102"></a>
<span class="sourceLineNo">103</span>     */<a name="line.103"></a>
<span class="sourceLineNo">104</span>    @Override<a name="line.104"></a>
<span class="sourceLineNo">105</span>    public void mark(int readlimit) {<a name="line.105"></a>
<span class="sourceLineNo">106</span>        throw new UnsupportedOperationException();<a name="line.106"></a>
<span class="sourceLineNo">107</span>    }<a name="line.107"></a>
<span class="sourceLineNo">108</span><a name="line.108"></a>
<span class="sourceLineNo">109</span>    /**<a name="line.109"></a>
<span class="sourceLineNo">110</span>     * Reset this instance. This operation is not supported by {@link BoundaryInputStream}.<a name="line.110"></a>
<span class="sourceLineNo">111</span>     *<a name="line.111"></a>
<span class="sourceLineNo">112</span>     * @throws UnsupportedOperationException always<a name="line.112"></a>
<span class="sourceLineNo">113</span>     */<a name="line.113"></a>
<span class="sourceLineNo">114</span>    @Override<a name="line.114"></a>
<span class="sourceLineNo">115</span>    public void reset() {<a name="line.115"></a>
<span class="sourceLineNo">116</span>        throw new UnsupportedOperationException();<a name="line.116"></a>
<span class="sourceLineNo">117</span>    }<a name="line.117"></a>
<span class="sourceLineNo">118</span><a name="line.118"></a>
<span class="sourceLineNo">119</span>    /**<a name="line.119"></a>
<span class="sourceLineNo">120</span>     * Determine if mark/reset is supported by this instance. Mark/reset is not supported by {@link BoundaryInputStream}.<a name="line.120"></a>
<span class="sourceLineNo">121</span>     *<a name="line.121"></a>
<span class="sourceLineNo">122</span>     * @return false always<a name="line.122"></a>
<span class="sourceLineNo">123</span>     */<a name="line.123"></a>
<span class="sourceLineNo">124</span>    @Override<a name="line.124"></a>
<span class="sourceLineNo">125</span>    public boolean markSupported() {<a name="line.125"></a>
<span class="sourceLineNo">126</span>        return false;<a name="line.126"></a>
<span class="sourceLineNo">127</span>    }<a name="line.127"></a>
<span class="sourceLineNo">128</span><a name="line.128"></a>
<span class="sourceLineNo">129</span>// Other public methods<a name="line.129"></a>
<span class="sourceLineNo">130</span><a name="line.130"></a>
<span class="sourceLineNo">131</span>    /**<a name="line.131"></a>
<span class="sourceLineNo">132</span>     * Get the flag byte that was found in the boundary string.<a name="line.132"></a>
<span class="sourceLineNo">133</span>     *<a name="line.133"></a>
<span class="sourceLineNo">134</span>     * &lt;p&gt;<a name="line.134"></a>
<span class="sourceLineNo">135</span>     * If this instance's {@link #read read()} method has not yet returned -1, then the return<a name="line.135"></a>
<span class="sourceLineNo">136</span>     * value from this method is undefined.<a name="line.136"></a>
<span class="sourceLineNo">137</span>     * &lt;/p&gt;<a name="line.137"></a>
<span class="sourceLineNo">138</span>     */<a name="line.138"></a>
<span class="sourceLineNo">139</span>    public byte getFlagByte() {<a name="line.139"></a>
<span class="sourceLineNo">140</span>        return this.parser.getFlagByte();<a name="line.140"></a>
<span class="sourceLineNo">141</span>    }<a name="line.141"></a>
<span class="sourceLineNo">142</span>}<a name="line.142"></a>
<span class="sourceLineNo">143</span><a name="line.143"></a>




























































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